Working of by-product-recovery gas-producers.



T. RIGBY & a. w. ANDREW.

WORKING 0F BY-FRODUCT RECOVERY GAS PRODUCERS.

APPLICATION FILED MAYI, 1914.

l ,23,@& Patented Sept. 11, 1917.

Arid/ways.

W Wmv-MW THOMAS BIGBY AND GEORGE V7. ANDREW, (BF DUMFEIEf-fi, SCUELAND, .tlSSIGNOYEi-E WETCARBONIZING LIMETED, OF LQNDGN, ENGLAND,

" Specification of Letters Patent.

Application filed may 7, 191%. Serial lilo. $37,661

by cooling in appropriate surface condensers the gases evolved in the'gasificetion of peat. The present invention has for its-object to modify the method of treatment of, the

; gases evolved from gas producers using cool and Worked for nitrogen recovery, of the Mend type, in order to permit of the eih- 'cient recovery of such bodies when gosifying peat in producers of the type in question.

This invention consists broadly in effecting cooling of the by-product bearing gases by indirect contact, as has been proposed, but eilecting it under such conditions of ten1- perature and the like that the Water vapor borne by the gases and the more vol: ti byproducts ere condensed outv of t e inses during this cooling by indirect contact, and the valuable lay-products such methyl elcohol so condensed are not, as in the usual systems of by-product recovery from Mend or other producers, lost by being taken up in the cooling "Water into direct contact With which the gases are usually passed.

In working byproduct recover e producers of Mondnud other types large quantities of steam are supplied to the producers, not only for the purpose of enriching the gas and lin'iiting the temperature of combusion in the producer, but of providing an cess of steam with which uncoinbined nu ol can form a further quantity chronic. The greater part of this steam V I through the producer, LL -ssues with the produ ithns subsequently; to

i re the gas ce be pro I Usually such separation fiec wd by circuluting a suitable liquid, h as Water, in direct contact with the producer gas, for the purpose of cooling the letter and condensing the accompanying steam, the heet thus gained bythe cooling liquid being then utilized by bringingthe liquid into direct of a;

nsunio l.

let

and intimate contact with the air supply on its way to the producers. In this Way the Worm cooling liquid is cooled by the air, and the letter saturated with water vapor, whereby a, great port of the steam required for the gas producers is thus recovered.

As the cooling liquid is thus circulated continuously in it closed cycle between the gZtS cooling ant. air heating apparatus, the cooling or the gas dependent upon the amount oi heatend water vs oer it u up by the air, with theresult that in practice the temperature of the leaving the cooling apparatus is in the neighborhood. '65? C, and the posses :iWu-y saturated with Water vapor at the exit temperature oi the cooling eppsretus.

As a result of Working gets producer by this method, besides the 1:11 tor and 1211; mount, at certain qu i'itity of volatile l t-- products, for instu cc nietl'iyl alcohol when using peat fuel, is in the cocllr g i in the apparatus diegrammatically illush l drawing the plied to c. produc' to which out i the letter ough the cone through a tor and other coiling point are con- 'sher is Z by is posed o u heater 0, throng; connected by pipe 8 *4 t a mixture oi air and steam in excess is introduced resulting is in the heater, w v, saturates it v to the W According to this inventio' or bypass is so edju, d of Water supplied Ito-the i sufficient to cool the prod temperature of from 66 to C usually about 66 in order that methyl alcohol particular shall not condensed in the Washer but shall pass gas. Such material is recovered by taking the gas through a pics 34 to a surface con denser 15 cooled byw sprayed on the through it with the outside thereof from a pipe 16. This cooling water collects in a IGSGIVOII" 1? surrounding the condenser, and passes therefrom through a pipe 18 to a sump 19, from Which-it is drawn up through a pipe 20 by a pump 21 provided With a by-pass 22, and thereupon returned by the pipe 16 to be" again used for-spraying the outside of the condenser 15. In this Way the gas 1s cooled out of contact With the cooling liquid, and

before leaving the system at 23 it is deprived of methyl alcohol and other valuable products of low boiling point, which as a result of condensation collect in the vessel 24!, from which they pass oifthrough a trap 25 and pipe 26 to a receiver 27. If the product sought is insoluble in Water non-volatile oil or other appropriate solvent from Which the substances are after-, Ward separated, for example by heating, can be used; .The operation is preferably conducted in a continuous manner by circulation of the solvent, not only in contact with the producergas, butalso through the still present in spite of the scrubbing-and cool ng processes, are also recovered by the same operation and thereafter abstracted from the circulating solvents in any suitable manner. This method of recovering products insoluble in Water may be used in Letters Patent is 1. In the utilization of peat, gasifying the peat in the presence of undecomposed steam to facilitate the production of ammonia, cooling the gases so produced to a temperature of from-66 to,90 C. by contact with a liquid, utilizing the warmed liquid thus obtained'to impart to the air the steam required for the gasification and further cooling the gases below a temperature of about 66 C. out of contact with the cooling liquid in order to facilitate recovery of methyl alcohol from the gases.

2. In the utilization of peat, gasifying the peat in the presence of undecomposed steam to facilitate the production, of ammonia,

cooling the gases so produced bya washingprocess to recover the heat of said steam,

utilizing the liquid of said washing process 'for imparting to the our the steam for the gasification process and thereafter effecting further coohng of the gases in a surface condenser to obtaln methyl alcohol and othe substances.

In testimony whereof We have signed our names to thisspeciiication 1n the presence of two subscribing Witnesses.

T. RIGBY. G. W. ANDREW. Witnesses:

BERTRAM H. MATTHEWS, C. S. DEALTRY. 

